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A process is described in which hollow spheres or hollow-sphere composites (moldings) having high-strength walls are produced. Additional layers are applied to metallized spherical lightweight particles having a core of foamed polymer. In order to increase the strength of the wall of the spherical p

A process is described in which hollow spheres or hollow-sphere composites (moldings) having high-strength walls are produced. Additional layers are applied to metallized spherical lightweight particles having a core of foamed polymer. In order to increase the strength of the wall of the spherical particle and the strength of the molding, metallized lightweight spherical particles having a metal wall thickness of 5 to 20 microns are treated (coated) with a dispersion of particulate metal or metal oxide or particulate ceramic or refractory material, the lightweight spherical particles coated in a thickness from 15 to 500 microns are dried, the dried particles are heated to a temperature of about 400°C. to effect a pyrolysis of the polymer core, and the particles are subsequently sintered at a temperature from 900°to 1400°C.

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A process for making hollow spherical particles, comprising the steps of: (a) providing metallized lightweight spherical bodies from cores of a foamed polymer with a metallic coating of a thickness of 5 to 20 microns; (b) coating said metallized lightweight spherical bodies with a dispersion of at l

A process for making hollow spherical particles, comprising the steps of: (a) providing metallized lightweight spherical bodies from cores of a foamed polymer with a metallic coating of a thickness of 5 to 20 microns; (b) coating said metallized lightweight spherical bodies with a dispersion of at least one particulate material selected from the group which consists of metals, metal oxides, ceramics and refractories to a dispersion coating thickness of 15 to 500 microns; (c) drying the dispersion coating on said metallized lightweight spherical bodies to form a dry layer of said material thereon; (d) heating said metallized lightweight spherical bodies with said dry layer of said material thereon to a temperature of about 400°C. to pyrolyze said polymer cores and form hollow bodies essentially consisting of said metallic coatings and said dry layers of said material thereon; and (e) subjecting said hollow bodies essentially consisting of said metallic coatings and said dry layers of said material thereon to a sintering temperature of 900°C. to 1400°C. for a period sufficient to sinter the material of the respective layer and the respective layer to the respective metallic coating, thereby forming hollow spherical particles.